Interesting post, thanks.
A friend of mine who is a psychologist often jokes about how she sees a diagnosis in everyone. She "has" Asperger and I ADHD and so on. No one is safe
The reason I asked about Depersonalization was that I felt I could recognize some if it symptoms. I was interested in what was going on in the DN and for a period I was extensively googling symptoms and reading up in forums all over the place. I ended up in a Depersonalization forum and it was scary but informative. Some people there seem to be going through what we here call the DN but they don't identify it as such but call it a disorder. It seems to eventually go away or become lighter but can take many years – just like a DN you don't do anything about.
The tricky part of this, at least to me, is that you can enter the DN without practicing meditation. It can happen out of the blue.
Now if you wake up one day feeling slow and down when you just a day before was up and energetic it might set you up on a really bad trip, much worse than it has to be. And you can end up with a diagnosis of some sort if you pursue it through psychiatry. My luck was that I brought it on while sitting so I assumed it had something to do with meditation and so I ended up anchoring here instead of some other place with deeper waters, not that these waters are in any way shallow.